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ADSR-CRUISE-11

Terceira 2019

RV Pelagia cruise 64PE456: Terceira Island 2019

RV Pelagia cruise 64PE456: Terceira Island 2019

The cruise also provided valuable information in the context of Good Environmental Status (GES), Marine Spatial Planning (MSP) and provided new insights on how to sustainably manage deep-sea ecosystems. During the RV Pelagia 64PE456 Terceira 2019 cruise, we performed 8 Hopper towed-camera system dives, an HD video platform specially designed to be operated on board of the RV Pelagia. From this, 4 dives were conducted in deep sandy bottom areas known to be important foraging grounds for marine mammals and 4 in the São Jorge de Fora seamount. This was the second time we sampled this poorly known seamount south of Terceira Island. In total, we collected 7:40 hours of video covering 4.5km of mostly sandy bottom in the abyssal plain and about 5:20 hours, covering 3.6km of the seamount seafloor.

Another example of a long-lasting collaboration with scientists from the Royal Netherlands Institute for Sea Research (NIOZ). This is the second time deep-sea scientists from IMAR Instituto do Mar and Okeanos University of the Azores have joined Fleur Visser cruises. The RV Pelagia cruise 64PE456 aimed to continue exploring the deep-sea areas of the Azores EEZ, namely around Terceira island and São Jorge de For a seamount; namely to (i) characterize benthic communities inhabiting seamounts in the Azores, such as São Jorge de Fora seamount, (ii) identify new areas that fit the FAO Vulnerable Marine Ecosystem criteria; and (iii) to contribute with additional data to address patterns and drivers of the distribution of deep-sea benthic biodiversity in the Azores region.

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Statistics

Transits
110 km
Multibeam Bathymetry
0 km²
Filmed Seabed
0 km
Visited Areas
2
Stations
8
Dives
8
Video Footage Recorded
13 hours
Used Storage
0.747 Tb
Samples
0
— No information available at this moment

Highlights

  1. Multibeam surveys finalised the compilation of bathymetry data of the São Jorge de Fora seamount which was started in 2018. This seamount was revealed to be a linear feature with 20+ peaks of different sizes, heights and shapes.
  2. Video transects enabled documentation of the deep-sea bottom communities and habitat characteristics at the exact location of whale deep foraging dives (100 – 1400 m) and at the São Jorge de Fora seamount.
  3. São Jorge de Fora seamount revealed a very clear zonation pattern regarding the structure of the benthic communities, with very well-defined species associations along the depth gradient. Overall, the area shows a high degree of sediment deposition and a low number of organisms within the communities identified.
  4. However, we discovered an aggregation of large gorgonians Callogorgia verticillate with high densities in some local patches.
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Participants

Scientific Crew

Gerald H. Taranto

Collaborators

Carlos Dominguez-Carrió
Marina Carreiro-Silva
Fleur Visser (PI of the cruise)
Andrea Schmidt

Location of operation

Southern slopes of Terceira Island (Azores EEZ)

AZORES DEEP-SEA RESEARCH © CRUISES

Terceira 2019

Activities

Video Survey (NIOZ Hopper towed-camera) Multibeam CTD

Meet us

Institute of Marine Sciences — Okeanos, University of the Azores

Departamento de Oceanografia e Pescas — Universidade dos Açores

Rua Prof. Doutor Frederico Machado, No. 4
9901-862 Horta, Portugal

Contact us

Email: azoresdeepsea@gmail.com

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